Hard metal alloy



Patented Dec. 30, 1941 UNITED STATES PATENT OFFICE man METAL ALLOY Robert W. Schlumpf, Houston, Tex., assignor to Hughes Tool Company, Houston, Tex., a corporation of Delaware No Drawing. Application November 10, 1941, Serial N0. 418,596

2Claims.

This invention pertains to the composition of hard metal objects which are resistant to wear and abrasion.

It is an object of the invention to provide an alloy composition which may be employed in the manufacture of tools or devices which are subject to heavy wear through abrasion thereon. It may be employed in the construction of nozzles for the discharge of fluid having abrasive particles such as sand therein.

I have found that an alloy made up of ele-' ments combined together in approximately the following proportions produces a satisfactory compound of this character:

. Per cent Car 1.50- 3.50 Manganese 0.50- 2.50 Silicon 0.50- 2.00 Chromium 14.0 -20.0 Tungst 14.0 -20.0 Boron 0.50- 1.50 Iron Balance to make up 100 Per cent Carbon 2.24 Manganese I 1.40 Silicon 1.19 Chromium 16.0 Tungsten 17.5 Boron 1.20

Iron .1 Balance to make up 100 Devices constructed from this alloy are extremely hard andalthough they are particularly adapted for sand blast or bit nozzles it will be obvious that the alloy is adapted for general use in the manufacture of,too1s to be employed in situations where exceptional wear is encountered.

What is' claimed as new is:

1. A hard ferrous metal alloy resistant to abrasion, comprising elements fused together in the following proportions:

Per cent Carbon 1.50- 3.50 Manganese -1 0.50- 2.50 Silicon 0.50- 2.00 Chromium 14.0 -20.0 Tungst 14.0 -20.0 Boron 0.50- 1.50 Iron Balance to make up 2. A hard metal casting composed of an alloy having ingredients in approximately the following proportions:

Per cent Carbon 2.24 Manganese 1.40 Silicon 1.19 Chromium 16.0 Tungsten 17.0 Boron 1.20

Iron Balance to make up 100 ROBERT W. SCHLUMPF. 

